Firearm.



R. VON FROMMER.

FIREARM.

APPLICATION FILED MAY 7. 1915.

1 1 6 1 1 '72 Patented Nov. 23, 1915.

RUDOLF VON FROMMER, 0F BUDAPEST, AUSTRIA-HUNGARY.

FIREARM.

Specification of Letters Patent.

Patented Nov. 23, 1915.

Application filed May 7, 1915. Serial No. 26,639.

To all whom it may concern:

Be it known that I, RUDoLF VON FROMMER,

a citizen of Hungary, residing at Soroksari ut 158, Budapest, IX,Austria-Hungary, have invented certain new and useful Improvements inFirearms, of which the following is a specification.

My invention has for its object to provide an improved firearm having abolt head capable of rotating or moving in the breech bolt, and aloading recess which interrupts the guide grooves for the breech bolt.

Firearms wherein the bolt head is capable of rotating or moving in thebreech bolt, have the drawback that at the place where the guide for thebreech bolt in the breech casing is interrupted by the loading recess,the bolt head is easily liable to jam while being opened and closed.This jamming is caused because the bolt head in passing the saidinterrupted portion of its guide, is liable through various causes torotate out of register with the breech bolt, and thereby change itsposition relatively to the breech bolt guide. Consequently, on beingmoved farther along into its guide, the bolt head strikes against theguide or jams in the guide. This drawback is particularly noticeable infirearms which have been for some length of time in use, and wherein theconnection between the bolt head and the breech bolt has become somewhatloose through wear and tear. On the other hand, the interruption of theguide grooves for the breech bolt by a loading recess is very important,because such a recess allows a much more easy and convenient loading ofthe firearm, since the cartridges can be pushed much more easily intothe cartridge chamber.

In order to obviate the above stated drawback, there is providedaccording to my invention in or below the groove in the breech casingfor guiding the breech bolt, an additional guiding means in the breechcasing as Well as on the bolt head or on the latters nib, and soarranged that it will guide the bolt head past the place of the breechbolt guide groove where the latter is interrupted by the loading recess.

By way of example my invention is illustrated in the accompanyingdrawing wherein- Figure 1 is a cross section of the guide for the breechbolt in the breech casing, and of the bolt head along line II of Fig. 2.Fig. 2 isa longitudinal section of the guide without the breech bolt andbolt head. Fig. 3 is a side elevation of the bolt head and a portion ofthe breech bolt, and Fig. 4 is a similar View as Fig. 2 showing thebreech bolt and bolt head.

1 is the breech casing in which for the purpose of guiding the bolt head2 and breech bolt 6 the usual guide gIOOXB 3 is provided which isinterrupted by the loading recess 4. In such an arrangement the nib 5 ofthe bolt head 2 loses at this point the guidance otherwise afforded bythe guide groove 3, so that the bolt head is liable to rotate out ofregister to some extent relatively to the breech bolt 6 or its guidingfillet 7, thus hindering the smooth forward and backward movements ofthe bolt head in the groove 3. To prevent such an occurrence, I provide,in the guide groove 3 for the bolt head, a guiding rib 8 adapted tocooperate with a guide gIOOXB 9 in the said nib 5 in such a manner thatthe bolt head will be securely guided at the place where the guidegroove for the breech bolt is interrupted by the loading recess. Thesame result of course is produced if the guiding rib 8 is arranged onthe guide nib 5, and the guide groove 9 is formed in the groove 3; thatis to say, the position of the rib and corresponding groove may bereversed, without changing the nature of the invention.

Claim:

In a breech-loading fire-arm of the type described, the combination ofthe breech casing having a guiding groove for the bolt head interruptedat one place by a loading recess, the breech bolt, the bolt head capableof rotating therein and provided with guiding means, and separateguiding means at the place of said loading recess adapted to cooperatewith the guiding means provided on the said bolt head.

In testimony whereof I affix my signature in presence of twowitnesses.

RUDOLF VON FROMlMER.

Witnesses:

FRITZ SCHiiN, HENRY M. SCHERRLY.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents, Washington, D. C.

